.net获取本机公网IP代码

using System;using System.Net;using System.Text.RegularExPRessions;namespace Keleyi.Com{    public class GetInternetip    {        public static string GetIP()        {            using (var webClient = new WebClient())            {                try                {                    var temp = webClient.DownloadString("http://iframe.ip138.com/ic.asp");                    var ip = Regex.Match(temp, @"/[(?<ip>/d+/./d+/./d+/./d+)]").Groups["ip"].Value;                    return !string.IsNullOrEmpty(ip) ? ip : null;                }                catch (Exception ex)                {                    return ex.Message;                }            }        }    }}